Sardines in a rich tomato sauce High in Omega 3 Fish Oils Consumption of Omega 3 fatty acids (3g per week), as part of a healthy lifestyle, helps maintain heart health. The best source of Omega 3 is oil-rich fish such as salmon, sardines, mackerel, kippers, herring and pilchards. The government recommends eating 2 portions of fish per week, one of which should be oily.